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Dr. agr. Wahyudi David
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wahyudi.david@bakrie.ac.id
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Kota adm. jakarta selatan,
Dki jakarta
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Asia Pacific Journal of Sustainable Agriculture, Food and Energy
Published by Universitas Bakrie
ISSN : -     EISSN : -     DOI : -
Asia Pacific Journal of Sustainable Agriculture, Food and Energy (APJSAFE), publish two times a year, publish papers in English reporting the results of original research in the following areas: Sustainable Agriculture, Food Technology and Sustainable Nutrition, Community Development and Scientific Communication, and Other related topics deemed relevant by the Editorial Board (Special Issues)
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Articles 3 Documents
Search results for , issue " Vol 4, No 1 (2016)" : 3 Documents clear
Application of Hydrolytic Enzymes for Improvement of Red Dragon Fruit Juice Processing Truong, N.M. Phuong; Dang, Q Tuan
Asia Pacific Journal of Sustainable Agriculture, Food and Energy Vol 4, No 1 (2016)
Publisher : Asia Pacific Network for Sustainable Agriculture, Food and Energy Network (SAFE Network)

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Abstract

The objective of this study was to improve the extraction efficiency and quality of the juice extracted from red dragon fruit (Hylocereus polyrhizus), by using commercial hydrolytic enzymes, namely Pectinex Ultra SP-L and Viscozyme L. The two enzymes were applied in constant total rate (0.1%), but at different combination ratios, temperatures and enzymatic treatment durations. By the effect of the enzymes, the extraction yield was significantly increased while the juice quality was obviously improved. High extraction yield (86.35%) and reducing sugar content in the juice (28.87 mg/mL) were obtained at temperature 40oC, in 120 min and with a combination of Pectinex Ultra SP-L and Viscozyme L (70/30). Meanwhile, extraction without enzyme treatment resulted in significantly lower yield (54.04%) and less reducing sugar content in juice (20.63 mg/mL). Also, by application of the enzymes at optimal conditions, the juice relative viscosity was reduced from 1.42 to 1.09, while the total acidity increased from 0.47 to 0.75 (g/100 mL), the TPC from 13.68 to 14.16 (mgGAE/100g puree) and the vitamin C content from 27.94 to 32.29 (mg/100g puree) as compared to the treatment without enzymes. Keywords— Cellulase, dragon fruit, fruit juice, hemicellulase, pectinase 
Determination of designing and operating parameters of circulating concurrent-flow rapeseed dryer Anh Duc, Le
Asia Pacific Journal of Sustainable Agriculture, Food and Energy Vol 4, No 1 (2016)
Publisher : Asia Pacific Network for Sustainable Agriculture, Food and Energy Network (SAFE Network)

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Abstract

This study aimed to investigate the designing and operating parameters of the circulating concurrent-flow dryer for rapeseed drying, such as drying section height, airflow rate, grain flow velocity, and drying air temperature, to meet the dryer performance in the best performance conditions, minimum cost, and the quality of seed. The simulation program which exhibited good fitness with experimental data performing on a pilot scale concurrent-flow dryer 200 kg a batch was used in this study. The results showed that the optimal parameters of drying section height, air flow rate, grain flow velocity and drying air temperature were found at 0.52 m, 30 cmm m–2, 5.5 m h–1, and 115oC, respectively. At these conditions, corresponding drying rate reached 3.01 %,w.b., fuel energy consumption was 4977 kJ kg–1 water, and germination rate was 94.5%. Keywords—rapeseed, drying section height, airflow rate, grain flow velocity, drying air temperature. 
Equilibrium moisture content isotherm characteristics of rapeseed Anh Duc, Le; Dong Hyuk, Keum
Asia Pacific Journal of Sustainable Agriculture, Food and Energy Vol 4, No 1 (2016)
Publisher : Asia Pacific Network for Sustainable Agriculture, Food and Energy Network (SAFE Network)

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Abstract

The ERH and EMC of rapeseed were determined using static method with a constant environment chamber for various combinations of air temperature and relative humidity. The moisture desorption isotherm data are used to determine EMC equation. Four EMC/ERH equations are recommended as the best predictions of equilibrium moisture content for grains and oilseeds over wide ranges of temperatures and relative humidity was used: the Chung-Pfost, modified Halsey, modified Henderson, and modified Oswin, and their estimated parameter were evaluated for goodness of fit. The Modified Halsey equation is identified as the best adequate equation for prediting desorption EMC isotherm of rapeseed. The RMSE for ERH and EMC is 1.909% and 0.281%. The R2 for ERH and EMC is 0.9936 and 0.9925, respectively.    The modified Oswin equation is fairly good fits, and the Chung-Pfost and modified Henderson equation could not available for prediction EMC of rapeseed. Keywords—rapeseed, equilibrium moisture content, isotherm, temperature, saturated salt

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